maven 项目添加spring mvc 支持

1.先打开pom.xml文件

在project根标签下添加如下标签

 UTF-8
 4.1.5.RELEASE

再在dependencies标签下添加如下标签

  
     
       org.springframework  
       spring-webmvc  
       ${spring.version}  
     
     
     
       org.springframework  
       spring-jdbc  
       ${spring.version}  
     
     
     
       org.springframework  
       spring-context  
       ${spring.version}  
     
     
     
       org.springframework  
       spring-aop  
       ${spring.version}  
     
     
     
       org.springframework  
       spring-core  
       ${spring.version}  
     
     
     
       org.springframework  
       spring-test  
       ${spring.version}  
     
    

2.修改web.xml文件

  
  
  Archetype Created Web Application  
    
      
    
    
    dispatcher  
    org.springframework.web.servlet.DispatcherServlet  
    1  
    
    
    
    dispatcher  
    /  
    
  
      
      
        encodingFilter  
        org.springframework.web.filter.CharacterEncodingFilter  
          
            encoding  
            UTF-8  
          
          
            forceEncoding  
            true  
          
      
      
        encodingFilter  
        /*  
      
    
    
  

3.在WEB-INF下添加dipatcher-servlet.xml

4.在com.wl.web目录下创建控制器（注意这个包可以是你自己创建的）Controller代码样例如下

/**
 * 用户信息控制类
 * @author wangliang
 *
 */
@Controller
@RequestMapping("/user")
public class UserController {
    //produces = {"application/json;charset=UTF-8"}
    @RequestMapping(value="/detail", method=RequestMethod.GET)
    private @ResponseBody String getUserByUid(@RequestParam(value="uid") String uid) {
        
        if(uid == null || "".equals(uid)){
            return ResponseUtils.generFailedJsonStr(1, "uid 不能为空");
        } else {
            UserInfo info = new UserInfo();
            info.setUid(uid);
            info.setName("用户" + uid);
            info.setAge(new Random().nextInt(40));
            
            String resp = ResponseUtils.generSuccJsonStr(JSONObject.parseObject(JSON.toJSONString(info)));
            System.out.println(resp);
            return resp;
        }
    }
    
    @RequestMapping(value="/list", method=RequestMethod.GET)
    private @ResponseBody String getUserList() {
        List users = new ArrayList();
        for (int i = 0; i < 10; i++) {
            UserInfo info = new UserInfo();
            
            info.setUid(String.valueOf(i + 1));
            info.setName("用户" + (i + 1));
            info.setAge(new Random().nextInt(40));
            users.add(info);
        }
        
        JSONObject data = new JSONObject();
        data.put("list", JSONArray.parse(JSON.toJSONString(users)));
        
        String resp = ResponseUtils.generSuccJsonStr(data);
        System.out.println(resp);
        return resp;
    }
    
    
}

5.访问如下

http://localhost:8080/demo/user/list
http://localhost:8080/demo/user/detail?uid=1

6.遇到的坑

• 坑1 @RequestMapping(value="/detail", method=RequestMethod.GET)把value="/detail" 写成name="/detail" 导致报错，主要是对API有些忘记了，是我个人的问题
• 坑2 返回值乱码问题
  这里有两种解决方案
  • 1.@RequestMapping(value="/detail",method=RequestMethod.GET, "application/json;charset=UTF-8")
  • 2.重写AbstractHttpMessageConverter方法

  public class UTF8StringHttpMessageConverter extends AbstractHttpMessageConverter {
   public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");  
     
   private final List availableCharsets;  
  
   private boolean writeAcceptCharset = true;  
  
   public UTF8StringHttpMessageConverter() {  
       super(new MediaType("text", "plain", DEFAULT_CHARSET), MediaType.ALL);  
       this.availableCharsets = new ArrayList(Charset.availableCharsets().values());  
   }  
  
   /** 
    * Indicates whether the {@code Accept-Charset} should be written to any outgoing request. 
    * 
  Default is {@code true}. 
    */  
   public void setWriteAcceptCharset(boolean writeAcceptCharset) {  
       this.writeAcceptCharset = writeAcceptCharset;  
   }  
  
   @Override  
   public boolean supports(Class clazz) {  
       return String.class.equals(clazz);  
   }  
  
   @Override  
   protected String readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException {  
       Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType());  
       return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset));  
   }  
  
   @Override  
   protected Long getContentLength(String s, MediaType contentType) {  
       Charset charset = getContentTypeCharset(contentType);  
       try {  
           return (long) s.getBytes(charset.name()).length;  
       }  
       catch (UnsupportedEncodingException ex) {  
           // should not occur  
           throw new InternalError(ex.getMessage());  
       }  
   }  
  
   @Override  
   protected void writeInternal(String s, HttpOutputMessage outputMessage) throws IOException {  
       if (writeAcceptCharset) {  
           outputMessage.getHeaders().setAcceptCharset(getAcceptedCharsets());  
       }  
       Charset charset = getContentTypeCharset(outputMessage.getHeaders().getContentType());  
       FileCopyUtils.copy(s, new OutputStreamWriter(outputMessage.getBody(), charset));  
   }  
  
   /** 
    * Return the list of supported {@link Charset}. 
    * 
    * 
  By default, returns {@link Charset#availableCharsets()}. Can be overridden in subclasses. 
    * 
    * @return the list of accepted charsets 
    */  
   protected List getAcceptedCharsets() {  
       return this.availableCharsets;  
   }  
  
   private Charset getContentTypeCharset(MediaType contentType) {  
       if (contentType != null && contentType.getCharSet() != null) {  
           return contentType.getCharSet();  
       }  
       else {  
           return DEFAULT_CHARSET;  
       }  
   }  
  

}

   然后在dispatcher-servlet.xml中添加(参考上边代码)
   ```
     
         
             
         
   
   ```

#####6.到此spring mvc集成到此完毕